There appear to be two issues here. Firstly your son seems to have preservative and colourant allergy. This is becoming more and more common in children these days. His stomach symptoms and some of his vomiting can be attributed to these allergies. Then there is the fall.I am always concerned when a child vomits after a fall and where he/she has a head injury however mild it may appear at the time. Vomiting may indicate anything from just the shock of the injury to concussion or to a possible cerebral bleed. It is definitely necessary to see your doctor.
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